Pop-ups ads are used extensively in advertising on the Web, though advertising is not the only application for pop-up windows.

Google does not allow pop-up ads of any kind on our site. We find them annoying. So why do they occasionally appear when you search on Google? Here are a few possible explanations:

Advertising is becoming more and more "in your face." There are now pop-up ads, ads that play music and sound tracks, ads that swim across the screen, and so on.

An ad that displays in a new browser window. (more) ... There is a strong resentment by some Web surfers towards pop-up ads. ... Google : No Pop-Up Ads on Google; Google's policy of pop-up advertising

Computer users are often bombarded with annoying pop-up advertisements. Separately, they also are often bombarded with annoying "spam"-- unsolicited commercial e-mail. ... Pop-up ads v. unsolicited e-mail

A handful of online brands are synonymous with pop-under ads. It's arguable travel provider Orbitz is at the top of that list. ... U.S. Ad Impressions up 21 Percent in October - Nov 24, 2009

Free yourself from unwanted pop-up windows with these programs. ... Pop-Up Stopper Free ... Eliminate irritating pop-up windows with this free program.

They watch you surf the Web. They plague you with pop-up ads. Then they cripple your hard drive ... Down the line, a big piece of the business winds up in the hands of outfits like Direct Revenue,

Pop-up ads disguised as Windows system administration alerts annoy users and puzzle security experts. Spammers, on the other hand, say the tactic works. ... By tapping into Messenger, ... The Messenger service,

This is an example of the pop-up that consumers received from a Texas firm sued for allegedly spreading "scareware." ... New Apple ads to Verizon: Can Droid do this?